Trigger mechanism for automatic firearms



Dec. 26, 1922.

l. N. LEWlS.

TRlGGER MECHANISM FOR AUTOMATIC HREARMS.

2 SHEETS-SHEET l.

FILED JAN-29,1919.'

Dec. 26, 1922. Y l. N. LEWIS.

TRIGGER MEcHANlsM FOR AUTOMATIC FIRE/mms.

-2 SHEETS-SHEET 2.

A FILED JAN. 29,1919.

Suva/toi laac N, Lewis.

Patented Dec. L26, 192.2.

ISAAC N. LEWIS, OF MONTCLAIR, NEW JERSEY.

'ramena MECHANISM ron AUTOMATIC FIREARMS.

Application filed January 29, 1919. Serial No. 273,722.

T all whom t may concern.'

Be it known that I., ISAAC-NEWTON LEWIS,

a citizen of the United States of America,

residing at 1 Russell Terrace, Montclair, 5 in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Trig er Mechanisms for Automatic Firearms, lowing is a specification.

This invention relates to automatic firearms, and particularly to the trigger mechanisms of such firearms.

In automatic firearms of the light machine gun type as now in use, the trigger mechanism s operable to control the actuating mechanism of the rearm to permit either semi-automatic or complete. automatic operation of the firearm. That is to say,

the trigger mechanism is of such a nature that, when the triggeris pressed and very quickly released, a single. operation of the actuating mechanism is permitted, to fire anv individual round, and when the trigger. is pressed and held in such position, repeated operation of the actuating mechanism is permitted to fire a plurality of rounds in rapid succession.

The primary object of the present invention is to provide an improved form of trigger mechanism of this general nature Which may be adjusted so that when it is desired to operate the irearmsemi-automatically, it is only possible. to fire a single round at each l'operation of the trigger mechanism, and which may also-be adjusted to fire entirely automatically so long as pressure on the trigger is maintained. Another object of the invention'is to provide a trigger mechanism which may be ad- 40 justed to a safety position in 'which discharge of the` firearm by accidental pressure of the trigger is entirely prevented.

The inventiony primarily comprises a trigger mechanism, Which are capable of relative adjustment to occupy different relative positions, said parts in one relative position permitting a single operation of said'actuating mechanism, and in another relative position per-` mtting repeated The invention also consists in that the operative parts of the trigger mechanism o which the fol-y havingl operative parts.

operation of said mecha-` nism, following each operation of'said parts.

'of 'trigger include a sear adapted in its normal position to restrain said actuating mechanism from operation, said Sear in one relative position of said parts, and at each operation thereof, being first released and then immediately restored to normal position, and in another relative position of the parts being released and held in inoperative position during maintained operation of said parts.

The invention further consists in that the. operative parts of the mechanism include two members, Such as a trigger and a sear, which are relatively adjustable to vary the extent of engagement of one member with the other, said engagement being such that in one relative position of the parts one of said members when operated engages land actuates and then immediately disengages from the other member, and in another relative position ofv the parts said member during maintained operation thereof, engages and actuates and remains in engagement with the other member, the latter member controlling the operation of the actuating mechanism.

' One of the said members able relatively to the other member by means of a pin having an eccentric portion co-acting with said member, said pin normally holding the member in one' relative position and being rotatable through a predetermined angle to-hold the member in another position, said member if desired being pivotally mounted onsaid eccentric portion.

The invention still further consists in that the operative parts of the mechanism are adjustable to occupy relative positions in which the. trigger mechanism may be operated without causing operation of the actuating mechanism. To this end, the aforesaidmembers of the mechanism may be adjustable into relative positions in which they are out of engagement with each other, .so that the one member may be op-A erated lwithout causing operation ofthe other member. 1

Various other will be fully described hereinafterl and may be adjust-` features of they invention clearly pointed out in the appendedr claims. p

In the accompanying mechanism constructedr in accordance with the vpresentinvention is illusdrawings 'one' formv partly in vparts of the body `course, forms no part of trated and is shown applied to an automatic firearm of the light machine gun tYPQ- In these drawings Figure 1 is a-longitudinal sectional View 0f the body or receiver of the gun, within which body the actuating mechanism is located, the trigger mechanism applied to this body being also shown in longitudinal section; Figure 2 is a view of the body or receiver of the gun similar to Figure 1, but showing the trigger pressed and theactuating mechanism in the position' it assumes at the instant of firing; i

Figure 3 isan end view of the body or receiver looking toward the muzzle of the gun and with the butt-stock and tang removed;

Figures 4 and 5 are cross-sectional views of the gun taken respectively on the lines 4-4`and 5-5 of Figure l;

Figure 6 is a detail side elevational view of t andi trigger mechanism looking at the side of the gun opposite to that shownin Figures 1 and 2;

F igurev is 'a plan view of the trigger mechanism removed from the body of the gull;

Figure 8 is an underneath plan view of the Vrear part ofthe trigger mechanism;

Figure 9 is an end vview of the trigger mechanism looking toward the rear thereof; F igures'lO and 11 are detail sectional views of the trigger mechanism showing .the operative parts thereof in the safety and automatic positions; v

Figure 12 is a vievi7 similar to Figure 11, but showing the parts in their relative positions when the trigger is pressed, and

Figures 13 and 14 are detailed plan views section of the trigger mechanism, the operative .parts being shown respectively in the positions corresponding with Figures 10 and 11. For the purpose of illustration only and without an intention of limiting the application of t e improved trigger mechanism thereto, said mechanism is-illustrated in the drawings as appliedv to a shock-operated automatic firearm of the character described 1n co-pending application No. 263824- filed November 23rd, 1918.

the present invention, but its arrangement and operation will e brieiiy mentioned in order to clearly show the manner of application of the trig er mechanism thereto, and the manner in which mechanism 'is adjustable and operable to control, the actuating mechanism of the firearm for semi-automatic or complete automatic operation thereof. f

When the breech block or bolt 1 is inV the rearward position indicated in F lgure land is .released by operation of the trigger mechanism in. the manner hereinafter described,-

This firearm, of

dividing wan 19 the return spring 2 moves the operating member 3 forwardly, and the post 4 of said member being in engagement with an inclined surface of a cam slot 4a in the bolt, the latter moves forwardly with the post and operating member, being prevented from rotating by a projection 5 engaging a slot 6 in the body 7 of the gun. As the parts advance in this relationship the lower front edge of the bolt engages the head of a positioned cartridge 8 and forces the same inadvance of the bolt into the chambered end of the gun barrel 9. p When the bolt engages the forward end of the barrel, the projection 5 engages a circumferential slot and permits the bolt to be rotated by the post 4 co-operating with the slot 4a to bring lugs on the bolt in front of lugs 10.0n the body Vso as to prevent rearward movement of the bolt when the cartridge is fired. Theoperating member 3 and post 4 then advance still further to carry the firing pin 11 forwardly to strike the head of the cartridge and fire the same. The gases of discharge resulting from the firing of the cartridge are utilized inthe manner described in vapplication No. 263823 filed November 23rd, 1918,

- to produce a shock or pressure'impulse which is imparted to the forward end of a piston 12, the rear end of which is indicated in Figure l, this piston being connected by a rod 13 to the operating member 3. This member is thusmoved grearwardly by the shock or pressure impulse" produced, and during such movement first. retracts the firing pin 11, then co-acts with the cam slot 4a:to rotate the bolt to release the lugs thereon from the lugs 10, and then engages the rear end of this slot to return the Abolt to its rearmost position, as indicated in Figure l, in which position it is again'held by a part of the trigger mechanism, as hereinafter mentioned. The bolt 1 is, of course, provided With extractors at its front end which d uring the return movement of the bolt withdraw the emp'tv shell from the hambered end of the gun barrel, this shell being ejected from the gun bodythrough an aperture 14 therein by means of suitable ejecting'mechanism 15, Figure 5.

Referring now in detail to the trigger mechanism, it will be seen from Figures 1, 2` and 7 that this mechanism comprises a ard or support 16 slidably fitted to the ower part of the body 7, the side faces of the guard being providedwith longitudlnal slots 17, Figures 3 to 5, 9 and 10, adapted .18 on the interior `of the lower part of the body, so that the guard may beslid into place from the rear end of the body, the forward end ofthe guard abutting against a y on the body, `and the 4rear end of the guard being 'flush with the rear end of the body.-

A.to co-act with longitudinal ribs or tongues 27 of said body. The scar is 'f urcated rear The Guard 16 is provided atl its upper.

portionbwith a recess 2O, within which are located the sear 21 and the trigger 22 coacting therewith. The Sear is pivotally mounted on a pin 23, and is normally held by a spring24 with its forward end against a stop 25 extending across said recess and its rear end elevated and extending through a slot 26 in the body 7, into the lower bore thus normally in a position to `engage a notch 28 in the bolt 1, when the latter is moved rearwardly a sulhcient distance, in the manner described, in order to restrain said bolt against the pressure ofthe return spring 2.

trigger 22-is pivotally mounted on a 29, hereinafter more fully referred to, is normally held by rear end in contact with the stop 25. The

pin and rear end of the trigger is bifurcated at 31,.

as shown particularly in Figures 7, 13 and 14, to receive the forward reduced end of the sear 21, and to provide a shoulder 32 adapted to co-act with said end of the sear.

In Figures 1, 2 and 7, the sear 21 and ltrigger 22 are `hown in the relative positions which they occupy when the gun is to be fired semi-automatically, that is when an individual round is lto be fired at each pressure of the trigger. With the parts in these relative positions, it will be noticed that when the trigger 22 is pressed itsbiportion will move upwardly in the recess 20, and the shoulder 32 will engage underneath the reduced forward end of the Sear-21 and will raise said end, lower# ing the rear end of the sear from the notch 28 in he bolt and therebyreleasing the latter and permitting it to be advanced by the return spring 2 acting through the operating member 3 and post 4 in the manner already described. When the bolt. is thus released and moves forward, the shoulder 32 snaps past the forward end of the sear, as shown in Figure 2, due to the relative movements of theI trigger and sear about their respective pivot pins, and the sear is returned to its initial position ready to engage andI hold the bolt whenithe latter is returned to its rearward position by the shock oi' pressure impulse produced following the discharge of the bullet. Figure 1 i, shows the parts in substantially the rearready to fire most positions to which they vare moved, the the notch 28 in the bolt, it being understood that in the positions, the operating member is advanced slightly relatively to the bolt to engage the post 4'with the inclined surfacey ofv the slot 4a. The trigger 22 when relieved of the pressure thereon, is returned to its initial position by its spring 30, the elongated aperture 33 permitting the necessary slight forward movement of the trigger to enable the shoulder 32 to pass The s a spring 3() with itsA i tated.

the forward end of ltheseariin resuming its normal position.

The trigger and sear are, ed to occupy relative positions other than vthose shown in Figures 1 and 2, that is, they may occupy the sa 'ety7 positions indica ted in Figures 10 and 13, in which the trigger may be pressed without actuating the scar, or they may occupy the automatic7 positions indicated in Figures 11, 12 and 14, in which while the trigger is held pressed, the sear vis retained ini inoperative position.

By referring to Figures 5, 7, 13 and 14, it will be seen that the trigger 22 is pivotally mounted upon the eccentric central por. tion 34 of the pivot pin 29, this eccentric portion lying within the elongated aperture 33 of the tri ger. The pin' is provided with an enlarge screw-threaded portion' 35 threaded into an aperture in the guard 16to retainthe pin in place, and with a handle however, adapti 36 by means of which the pin may be ro- When the pin is rotated by means of the handle 36 in a counter-clockwise direction through approximately a quarter revolution, from the p'osition'shown in Figures 1, 2 and 7 to that shown in Figures 10 and 13, the trigger 4is moved slightly. forwardly by the eccentric portion 34, so that the shoulder 32V is advanced to bring it just in front of the forward end of the sear and when the trigger` is pressed the shoulder will rise in front of the forward end of the sear without actuat.- ing the latter. Thus pressure on the trigger while in this safety position,me`rely rocks the trigger on its pivot pin and the sear is not actuated, neither is the bolt released. When the trigger is in this position'the gun may be carried in entire safety with the bolt held in the position shown in Figure- 1 and without danger of the 'firearm being discharged by accdenta-l pressure upon the trigger.

When the pin 29 is rotated by the handle v36 in a clockwise direction through mately a quarter of a revolution, from the position shown in Figures 1, 2 and 7, to that shown in Figures 11, 12 and'14, the eccentric portion 34 of the pin moves rearapproxi# wardly and permits aslight rearward move? ment of the trigger so that the shoulder 32 passes further beneath the front. end of the sear, as in Figure 11. Thus when the trigger is'pressed, the shoulder 32 engages the front end ofthe scar and actuates the same to release the b olt as previously described, but

instead -of snapping past the end of the sear, as indicated in Figure 2, said shoulder re# mains in engagement therewith s o long as igure 12. The bolt then on its rearward movement is not held by the sear, but when l it has moved rearwardly sufficient to clear the head of the succeeding cartridge 8, it is i again pressed forwardly by the spring 2,

the operation being repeated until the trigger is released, or the magazine eX-' hausted.

There is thus provided a trigger mecha- I nism, the operative parts of which are adapted to occupy several relative positions, namely, lthe safety position in which the trigger mechanism may be operated without releasing the actuating mechanism so as to prevent accidental discharge of the firearm; secondly, the automatic position in which by maintaining pressure on the trigger the sear is held in inoperative posi'- 1 tion and the actuating mechanism permitted torepeatedly operate' to fire a plurality of rounds in continuous succession, and thirdly, theL'semi-automatic position in which the actuating mechanism .at each pressure of the trigger is only permitted a single actuation so that it is only possible to lire a single round at each operation of the trigger mechanism. f The handle 436 is somewhat resilient or springy and is provided with a notch or groove 37 adapted to coact with the part 38 of the guard 16 to normally 22 in the zcsemiautomatic position, as in Figure l.

`When the` handle is moved i'nto the safety or automatic positions indicated in dotted lines in Figures 6 and 7 and in full lines in Figures 13 and 14, it is held in such positions by its resilient frictional pressure against the exterior surface of the 'guard 16. It is, of course, understood that the pin 29 is so constructed that the slight axial movements thereof when it is rotated, due to the screw-threads on the portion 35,

will not interfere with the movements of the trigger or cause the parts to jam, sufficient play being allowed to permit these movements. y

The cartridges may be fed intoA the chainbered end of the gun barrel from a magazine of any convenient or usual type. In Figures 1 and 2 a magazine 39 is illustrated adapted to contain a pluralityof cartridges which are pressed upwardly into position to be engaged by the bolt 1 by means of a follower` 40 actuated by a spring 41. The magazine'is inserted in a recess formed in the lower part v of the body 7 in communication with the lower bore 27 therein, the forward wall of the'magazine having an aperture adapted to engage over a'pin 42 in the forward-wall of the recess, and the rear wall of the magazine coacting with a latch 43 which extendsv through an aperture in the wall 19 into a notch or'aperture 44 in the said .rear wall, which wall may be slightly pressed out above the notch, as indicated, more secure- '1y co-act with Vthe latch. l

hold the trigger,

The latch 43, as shown in .Figures 1, 7 and 9, is mounted in a recess in the forward end of the guard 16 of the trigger mechanism,

the latch having tongues 45 on its side facesj coacting with corresponding grooves in the walls of said recess and being pressed for# wardly by a spring 46. The forwardand rearward movements of the latch are limited..

kThuswithout substantially changing'the p0- sition of the hand in firing, an empty car trldge magazine may be released from the firearm and a loaded magazlne substituted i in place thereof by means of tlie other hand,

enabling the reloading of the irearm to be effected with extreme rapidity and ease.

riheassembled butt-stock and butt-tang 51 are "removably connected to/I the body 7 in the manner illustrated in Figures 1 and 2.

The tang is formed with Ia,'forwardly eX- `tending flange 52, the forward edge of which has 'an inwardly extendingl flange the flange 52 corresponding in shape to the rear end of the body and its lower portions being l open or cut away. The rear end of the body is provided with an outwardly extending flange 54. The tang may thus be slid downwardly over the end the body portion with the said end in contact with the butttang plate 55, and the flange 52 will, when the tang is in place, prevent downward and.

lateral movement thereof and the plate 55, and the co-acting Hanges 53, 54 will prevent relative longitudinal movement between the tang and body. To prevent the tang being removed upwardly from the body except when itis desired to disconnect the stock and tang from the body, the plate 53 is provided at its lower-part with a notch or aperture 56 with which the nose 57 of a pivoted latch 58 is adapted to engage, This latch u is pivoted on a pin 59within a recess .60 in the rear end of the guard 16 ofthe trigger' mechanism, this ,latchiwhen in' the position indicated in Figure 2, permittingthebuttv tang to be applied and removed and when in the position indicated in Figure 1, preventing removal of rthe tang by engagement l of itsnose 57 with the lower'wall of the notch 56. The forward portion of the latch is bifurcatedat 61 (see Figures 7 and 8) and v the arms of the bifurcation arey normally slightly s read' apart so that when4 in the position o Figure l, they resiliently engage the walls of the recess in the guard with suiiicientpressure to hold the latch in locking position. The forward end of the latch is provided with an aperture 62Y and the l pins and at the same a bullet in one of been described above in detail it is, to be understoodv that the invention is not in' formed, I declare guard adjacent said aperture has recesses 63, so that by the insertion of the pointed end of the recesses and in the aperture 62, the latch may be readily released to permit the butt-tang and stock to be removed from the body. Y

It will thus be seen that the guard 16 of the trigger mechanism is held in place by the butt-tang when the latter and the buttstock are positioned on the body, and that the guard is provided at its rear and front ends with means for holding in place the tang and butt-stock and the cartridge maga-` zine. .The lowermost edges 64 of the body 7 y preferably extend downwardly a su'cient distance to cover the pins 23, 47 and 59 of the trigger mechanism so as to conceal these time to prevent accidental displacement thereof, the pins being simply pressed into vplace and held there .by the said edges. rlihe edges 64 are notched at 65 to receive the end of the handle 36'.

While one form of trigger mechanism has of course,

any way restricted to this particular form of trigger mechanism, but that the constructional features thereof may be varied as may be found desirable or necessary to adapt the mechanism 'to any particular construction of iirearm, or for any other purpose. Nor is the invention restricted to its use with any particular form of automatic firearm. The

.essential feature of the` invention as has been indicated above, is the provision of a trigger mechanism, the operative parts of which are adapted to be adjusted into dierent positions, in one of which the actuating mechanism is controlledfor semi-automatic firing, and in anotherof which said mechanism is controlled for complete automatic iring.l

In a third position the operative parts are positioned ,so that described and said invention and in what manner the same is to be perthatwhat l claim is l. Trigger mechanism' for automatic firearms, comprising in combination, a one-piece sear member, vand a' one -piece trigger member having overlapping engagement, and positively acting means operable prior Having now particularly to and -independently of the actuation of said mechanism in firing for-bodily 'adjusting one of saidl members relatively to the other. to vary the extent of said Yoverlapping engagement from a matic firing, or vice versa. 2.` Trigger mechanism for automatic irearms, comprising in combination, a movable operating member receiving 'tentyof engageme Vminimum for single shot firing to a maxiaccidental discharge of'- 4the firearm is entirely prevented.

minimum for single shot4 -ring to a maximum for continuous auto having integral pressureA ment Vto maintain and .pressure applying parts a secg ond 1movable member having a part rigidtherewith and engagedby the-pressure applying part of theoperableprior to and independently of -the actuation of said mechanism in ringvfor moving one of said members bodily relatively to the 'other Vmember to vary the -exnt of said parts from a mum for continuous automatic firing, or vice versa. v y l .3. Trigger mechanism for automatic firearms, comprising in combination, a one piece `trigger member, a movable member having. overlapping engagement with apart of said trigger member, and independently ofmechanism in firing for. bodily adjusting said trigger member relatively to said movable member to vary the overlapping relation therebetween from a minimum for sinand means operable priorto first member, and means the actuation of said" gle shotriring to 'a maximumfor continuf l ons automatic iiring,vor vice versa,

4, Trigger mechanism for automatic firearms, comprising in combination, two members movable about pivotal axes and having rigid operating parts in gagement along a line f passingV `approximately through said axes,

.and means operable prior to .and independently of the actuation of said mechanism in'v firing for bodily moving one member relatively tothe other to vary the overlapping Ven-V distance between said axesA and to vary the extent of said overlapping f' eng: gement from a minimum for single shot ring to. a maximum for continuous automatic ring, oi' viceversa. Y y 5.' Trigger mechanism for automatic firearms, comprising in combination, a pivote member having an operatingpart integral l therewith, a second pivoted member having an integral operating partl engaged by the operating part of the first'member, and adjustable means operable pendently of the actuation of said mechanism in firing operative to vary the distance between the pivots of said members to dctermine the extentof operative engagement of said parts for single shot firing orcontinuous aut" matic iring.- Y

6. Trigger mechanism for automatic firearms, comprising in combination,` a .pivoted member having a rigid operating part, a second pivoted member having a part thereof operatively engaged by theroperating part of the iirst member, said .parts being disengaged by predetermined annular movement of said members about their pivots, and means operable prior to and independently of the Aactuation of said mechanism in firing for moving one of said members bodily relatively to the other member to 1ncrease theextent of said operative engagethe saine during said anular movement.

7 Trigger mechanism forautomatic fireprior to and indejtomatic firing, or vice versa.

8. Trigger mechanism for automatic lirearms, comprising in combination, a pivoted integral movable member, a second pivoted integral movable member operatively engaged by the first member, and means `for varying the distance between the pivots of said members to vary the extent of 'the operative engagement thereof from a minimum for single shot firing to a maximum p.

for continuous automatic firing, or 4vice versa.

9. Trigger nechanism for automatic firearms, coinprising in combination, an integral .movable member, a second integral member movable about an axis and having operative engagement with the first member, and means for displacing the pivotal axis of the second member from one position in which said members have minimum operative engagement for single shot firing to a second position in which said members have maximum operative engagement for continuous automatic firing, or vice versa.

10. Trigger mechanism for automatic firearms7 comprising in combination, an integral member movable about a fixed pivot, a second integral member movable about an axis and having operative engagement with" the first member, and means for displacing the pivotal axis 01"] the' Second membertoward the fixed pivot of the -rst 'member from a position in which said members have minimum-operative engagement for single shot firing to a position Iin which said members have maximum operative engagement for continuous automatic firing, or vice versa. ll. Trigger mechanism. -for automatic rearmscomprising in combination, an integral movable member, a second integral member having operative engagement with the first member, and a pivot pin having an eccentric portion on which thevsecond integral member is pivotally mounted, said pivot pin being yrotatable about a xed axis to move said eccentric portion from aposition in which said members have minimum Operative engagement for single shot firing to a 'position in which said members have maximum operative engagement for continuous automatic firing, or vice versa.

12. Trigger mechanism for automatic firearms, comp-rising in combination, an integral sear pivotally movable 'about aix'ed axis, a pivoted integral trigger having operative engagement with said Sear, and a pivot pin for said trigger movable about a xed axis and having an eccentric portion on which said trigger' is mounted, said pin being rotatable to displace said eccentric portion and the trigger thereon 'toward or from the pivotal axis of the sear to vary the operative engagement of the trigger with the sear for single shot or continuous automatic firing. y 13. Trigger mechanism for automatic firearms, comprising in combination, two movable members normally having overlapping engagement, and supporting means for one of said members operative to bodily adjust said member relatively "to the other vinto a safety position in which said members are out of overlapping engagement. l

14C. Trigger mechanism for automatic firearms, comprising in combination, two members movable about .pivotal axes and having parts in voverlapping engagement, and lpivot means for one of said members operative to` bodily move said member relatively to the other toincrease the Adistance between said axes so that'said members 'are out of overlapping engagement.

15. Trigger mechanism for automatic firearms, comprising in combination, a

pivoted member having an operating part integral therewith, a second pivoted memberv having an integral operating part, and adjustable means operative to vary the distance between the pivots oi. said members `to move said operating parts' from a safety vposition in which they are outof operative engagement to a i'iring position' in which said lparts are inoperative engagement, or vice versa. v Y

16. Trigger mechanism for automatic firearms, comprising in combination, an integral movable member, a second integral movable member operatively engaged by the f first member, and means for producing bodily relative movement between said'mem'- bers into yrelative positions in which they arev out of operative engagement and the second member may be operated without operating the 4first member. v 17. Trigger, mechanismV for automatic firearms, comprising in combination, an integral movable member1 a second integral member movable about an axis, and means for displacing'- the pivotal axis of the second member from a safety position in which said members are out of operative engagement to a firing position in which said members are in operative engagement, or vice V6 I'S al.

18. Trigger mechanism for automaticfirearms, comprising in combination, an integral member movable about a fixed pivot,

'a second integral member movable about an axis, and means for displacing the piviso' engagement, or vice versa.

ota'l axis of the second member away from' the pivot of the first member froma. firing position in which said members have operative engagement to a safety position in which said 4members are out of operative 19. Trigger mechanism for automatic firearms, comprising in combinatiom-aii inoperative tegral 4movable member, a second iii-- portion from a firing position in which said combination, a body portion, breechmechmembers are .in operative engagement to a safety position in which said vmembers are out of operative engagement, or vice versa.

20.'An automatic firearm, comprising in anism movable within said body portion, a

` tion atthe under side thereof, and a butt port to'hold the same in p ace, and a butt Y trigger mechanism controlling said breech mechanism, a support for said trigger mechanism slidably connected .to said body portangremovably, connected to the rear end of said body portion and en aging said supstoclz. removably connected to said tang.

2l. An` Aautomatic firearm, comprising Ain combination, a bodyI portion, breech mechanism movable within .said body portion,`, trigger mechanism controllin said breech mechanism, a support for sai trigger mechanism longitudinally slidably connected to said body portion at the under side thereof, and a butt stock removably connected to the rear end of said body portion by a sliding moivement at right' angles to the sliding movement of the trigger support, said-butt stock engaging said'- support at the rear end thereof to hold the same in place.

22. An automatic firearm, comprising in hl'a pivoted member having a rigid operating combination, a body -portion,"breech` mec anism Withinv said body portion, Atrigger mechanism controlling said breeclimechanism, a support for said trigger mechanism.

-slidably connected to said body portion at'the under side thereof, a butt stock removably connected to the rear "end of said; body portion and engaging said support vtohold the same in place, and means on Vsaid support normally preventing removal of said -buttstock.` v

23. An automatic' firearm, 4comprising in combination, a body portion, b reh mech. anism within 'said body portion, .trigger mechanism controlling j said breech mechvally mounted in said recess fixed axis to vmove said eccentricl slidably connected to said portion,

alsupport for said trigger" mechanism slidablyf connected to said body portion at the under side thereof, a butt stock removably connected to' the rear end of said body `portionand engaging said support to hold the same in place, a recess at the rear end of said support, and a member pivot-l and normally co-acting withv an aperture in the butt stock to prevent removal thereof.

'24. An automatic firearm, comprising in anism, i

combination, a body portion, breech mech` anism within said body portion, trigger mechanism 'controlling' said breech mechanism, asupport for said trigger mechanism slida'bl', connected to said body portion at' theun er side thereof, a butt stock removably connected tothe rear end of said body portion and engaging said support to hold the same in place, a recess 'atthe rear end of said support, and a member 'pivotally mounted in said recess and normally coactiiig with an aperture in the butt stock to vrevent removal thereof,` said member having a bifurcated portion resiliently gripping vthe walls of' saidi recess in locking position. A

' 25. An automatic firearm, comprising in combination, a body portion, breech mech# Vanism within said body portion, a trigger mechanism controlling said breech mechanism, a support for said trigger mechanism 'body portion at the under, side thereof, a butt stock removably connected to theli rear end ofsaid body a cartridge magazine removably secured to said body portion at the under side thereof,1 and means carried by said Vsupport at the. forward and rearward ends Vthereof for respectively releasably holding in place said cartridge magazine and butt stock.

A 26.' rIrigger mechanism for vautomaticl firearms, comprising in combination, a. mov# able member having a rigid operating part,

part inoperative, engagement with said #movable member, and a pivot pin for said ica 

